171291 has 4 divisors (see below), whose sum is σ = 228392. Its totient is φ = 114192.

The previous prime is 171271. The next prime is 171293. The reversal of 171291 is 192171.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 171291 - 2⁷ = 171163 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28546 + ... + 28551.

It is an arithmetic number, because the mean of its divisors is an integer number (57098).

2¹⁷¹²⁹¹ is an apocalyptic number.

171291 is a deficient number, since it is larger than the sum of its proper divisors (57101).

171291 is an equidigital number, since it uses as much as digits as its factorization.

171291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57100.

The product of its digits is 126, while the sum is 21.

The square root of 171291 is about 413.8731689781. The cubic root of 171291 is about 55.5364584732.

The spelling of 171291 in words is "one hundred seventy-one thousand, two hundred ninety-one".